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Basic patient characteristics
| Age (years)a | 31 (27; 35) |
| Body mass index (kg/m2)a | 22.8 (21.0; 25.7) |
| Previous second trimester miscarriage or preterm deliveryb | 7 (9.0) |
| Previous conizationb | 3 (3.8) |
| Pregnancy after IVF treatmentb | 53 (67.9%) |
| Parityb | |
| 0 | 55 (70.5) |
| 1 | 18 (23.1) |
| ≥2 | 5 (6.4) |
| Cigarette smoking during pregnancyb | 9 (11.5) |
| Chorionicityb | |
| 1 | 1 (1.3) |
| 2 | 22 (28.2) |
| 3 | 55 (70.5) |
| Amniocityb | |
| 1 | 0 |
| 2 | 0 |
| 3 | 78 (100) |
Data are presented as a median (interquartile range) or b numbers (frequencies)
